Two monochromatic light beams have intensities in the ratio 1:9. An interference pattern is obtained by these beams. The ratio of the intensities of maximum to minimum is

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I m i n ​ I m a x ​ ​ = ( I 1 ​ ​ − I 2 ​ ​ ) 2 ( I 1 ​ ​ + I 2 ​ ​ ) 2 ​ ⇒ ( 2 ) 2 ( 4 ) 2 ​ ⇒ 4 16 ​ = 4

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